SearchFacesByImage

For a given input image, first detects the largest face in the image, and then searches
the specified collection for matching faces. The operation compares the features of
the input
face with faces in the specified collection.

注記

To search for all faces in an input image, you might first call the IndexFaces operation, and then use the face IDs returned in subsequent
calls to the SearchFaces operation.

You can also call the DetectFaces operation and use the bounding boxes
in the response to make face crops, which then you can pass in to the
SearchFacesByImage operation.

You pass the input image either as base64-encoded image bytes or as a reference to
an
image in an Amazon S3 bucket. If you use the
AWS
CLI to call Amazon Rekognition operations, passing image bytes is not
supported. The image must be either a PNG or JPEG formatted file.

The response returns an array of faces that match, ordered by similarity score with
the
highest similarity first. More specifically, it is an
array of metadata for each face match found. Along with the metadata, the response
also
includes a similarity indicating how similar the face is
to the input face.
In the response, the operation also returns the bounding
box (and a confidence level that the bounding box contains a face) of the face that
Amazon Rekognition
used for the input image.